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dc.contributor.authorZnad, Hussein
dc.contributor.authorAng, Ming
dc.contributor.authorTade, Moses
dc.date.accessioned2017-01-30T14:33:10Z
dc.date.available2017-01-30T14:33:10Z
dc.date.created2015-03-03T20:16:39Z
dc.date.issued2012
dc.identifier.citationZnad, H. and Ang, M. and Tade, M. 2012. Ta/TiO2-and Nb/TiO2-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity. International Journal of Photoenergy. 2012: Article ID 548158.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/39346
dc.identifier.doi10.1155/2012/548158
dc.description.abstract

Ta/TiO2- and Nb/TiO2-mixed oxides photocatalysts were prepared by simple impregnation method at different TiO2 : Nb or Ta mass ratios of 1 : 0.1, 1 : 0.5, and 1 : 1, followed by calcination at 500∘C. The prepared powders have been characterized by XRD, XPS, UV-Vis spectra, and SEM. The photocatalytic activity was evaluated under natural solar light for decolorization and mineralization of azo dye Orange II solution. The results showed that Nb/TiO2- and Ta/TiO2-mixed oxides have higher activity than the untreated TiO2 under natural solar light. The maximum activity was observed for Nb/TiO2 sample (at mass ratio of 1 : 0.1), which is characterized by the smallest crystalline size (17.79 nm). Comparing with the untreated TiO2, the solar decolorization and mineralization rates improved by about 140% and 237%, respectively, and the band gap reduced to 2.80 eV. The results suggest that the crystal lattices of TiO2 powder are locally distorted by incorporating Nb5+ species into TiO2, forming a new band energy structure, which is responsible for the absorption in the visible region. Unlike Ta/TiO2, the Nb/TiO2-mixed oxides can prevent the grain size growth of the treated TiO2, which is important to achieve high solar photoactivity.

dc.publisherHindawi Publishing Corporation
dc.titleTa/TiO2-and Nb/TiO2-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity
dc.typeJournal Article
dcterms.source.volume2012
dcterms.source.startPage548158
dcterms.source.endPage1
dcterms.source.issn1110662X
dcterms.source.titleInternational Journal of Photoenergy
curtin.note

This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons License http://creativecommons.org/licenses/by/3.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work

curtin.departmentDepartment of Chemical Engineering
curtin.accessStatusOpen access


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